CA2093704A1 - Method and system for monitoring quality of phosphate coating - Google Patents

Method and system for monitoring quality of phosphate coating

Info

Publication number
CA2093704A1
CA2093704A1 CA2093704A CA2093704A CA2093704A1 CA 2093704 A1 CA2093704 A1 CA 2093704A1 CA 2093704 A CA2093704 A CA 2093704A CA 2093704 A CA2093704 A CA 2093704A CA 2093704 A1 CA2093704 A1 CA 2093704A1
Authority
CA
Canada
Prior art keywords
phosphate coating
metal surface
defects
potential
monitoring quality
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2093704A
Other languages
French (fr)
Other versions
CA2093704C (en
Inventor
Frank A. Ludwig
Bruce M. Eliash
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of CA2093704A1 publication Critical patent/CA2093704A1/en
Application granted granted Critical
Publication of CA2093704C publication Critical patent/CA2093704C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/301—Reference electrodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S204/00—Chemistry: electrical and wave energy
    • Y10S204/08—AC plus DC

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Molecular Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

A method and system for monitoring the quality of a phosphate coating on a metal surface having a large surface area. The method comprises applying a current or potential between the metal surface and one or more counter electrodes while they are in the phosphating solution and superimposing a constant ac signal thereon.
An ac impedance spectra is obtained by measuring the ac potential between the metal substrate and one or more reference electrodes located between the counter electrode and the substrate. The ac impedance spectra provide an indication of defects in the phosphate coating even when the defects are located within a relatively small region of the total surface area of the metal surface.
CA002093704A 1992-05-12 1993-04-27 Method and system for monitoring quality of phosphate coating Expired - Fee Related CA2093704C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/881,586 US5324399A (en) 1992-05-12 1992-05-12 Method and system for monitoring quality of phosphate coating
US881,586 1992-05-12

Publications (2)

Publication Number Publication Date
CA2093704A1 true CA2093704A1 (en) 1993-11-13
CA2093704C CA2093704C (en) 1998-01-06

Family

ID=25378767

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002093704A Expired - Fee Related CA2093704C (en) 1992-05-12 1993-04-27 Method and system for monitoring quality of phosphate coating

Country Status (6)

Country Link
US (1) US5324399A (en)
EP (1) EP0569826B1 (en)
JP (1) JP2661858B2 (en)
KR (1) KR930023488A (en)
CA (1) CA2093704C (en)
DE (2) DE69308369D1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19546206A1 (en) * 1994-12-19 1996-06-20 At & T Corp Coating esp. chemical plating process
US5466349A (en) * 1995-01-06 1995-11-14 Rockwell International Corporation Potentiometric evaluation of substrate oxidation and coating porosity
US5739692A (en) * 1995-11-08 1998-04-14 E. I. Du Pont De Nemours And Company Device for monitoring voltage and amperage on an article being passed through an electrocoating bath
JP3143780B2 (en) * 1996-06-10 2001-03-07 本田技研工業株式会社 Corrosion resistance test method and electrolysis tester for specimen consisting of metal material and coating film
JP3062807B2 (en) * 1997-05-06 2000-07-12 本田技研工業株式会社 Corrosion resistance test method for specimen consisting of metal material and coating film
US6631562B1 (en) * 1999-10-13 2003-10-14 Ford Global Technologies, Llc Method for coating radiator support assembly
US6737360B2 (en) * 1999-12-30 2004-05-18 Intel Corporation Controlled potential anodic etching process for the selective removal of conductive thin films
WO2006083351A2 (en) * 2004-11-18 2006-08-10 Ndsu-Research Foundation Calibration method and apparatus for potentiostats
CN102269729B (en) * 2010-06-07 2014-11-05 鞍钢股份有限公司 Method for detecting quality of phosphating film
EP2656044A4 (en) 2010-12-21 2015-07-01 Coatings Foreign Ip Co Llc Process of evaluating corrosion resistance

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132438A (en) * 1933-12-11 1938-10-11 American Chem Paint Co Method of coating metal
US2766423A (en) * 1951-09-08 1956-10-09 Nat Res Dev Polarographs
US3841988A (en) * 1973-03-12 1974-10-15 Lockheed Aircraft Corp Control for impressed current cathodic protection systems
US4019129A (en) * 1975-06-02 1977-04-19 Bell Telephone Laboratories, Incorporated Metallic plating testing apparatus
US4310389A (en) * 1980-06-16 1982-01-12 Chrysler Corporation Method for simultaneous determination of thickness and electrochemical potential in multilayer plated deposits
US4515643A (en) * 1982-10-22 1985-05-07 Henkel Kommanditgesellschaft Auf Aktien Method for determining and adjusting the potency and effectiveness of a metal phosphate conversion coating process
US4500391A (en) * 1983-10-13 1985-02-19 Allied Corporation Method of and system for real time differential pulse detection
GB2153854A (en) * 1984-02-03 1985-08-29 Fosfacol S P A Automatically controlling the phosphate coating of metals
US4718990A (en) * 1985-02-28 1988-01-12 C. Uyemura & Co., Ltd. Method for detecting start of electroless plating
DE3511706C2 (en) * 1985-03-29 1987-02-19 Heusler, Konrad, Prof. Dr., 3392 Clausthal-Zellerfeld Method and device for testing electrically insulating protective layers on metal parts
US4631116A (en) * 1985-06-05 1986-12-23 Hughes Aircraft Company Method of monitoring trace constituents in plating baths

Also Published As

Publication number Publication date
CA2093704C (en) 1998-01-06
JPH0633260A (en) 1994-02-08
EP0569826A1 (en) 1993-11-18
DE69308369T4 (en) 1998-01-08
US5324399A (en) 1994-06-28
JP2661858B2 (en) 1997-10-08
DE69308369T2 (en) 1997-06-12
DE69308369D1 (en) 1997-04-10
KR930023488A (en) 1993-12-18
EP0569826B1 (en) 1997-03-05

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Legal Events

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